document.write( "Question 714993: The graph of f passes through (-8, 15) and is perpendicular to the line whose equation is x=-15
\n" ); document.write( " . What is the slope intercept form? \n" ); document.write( "

Algebra.Com's Answer #439198 by KMST(5328) $\"\"$ $\"About$

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The line $\"x=-15\"$ is what we call a \"vertical\" line, with \"undefined\" slope.
\n" ); document.write( "(It is vertical on my computer screen).
\n" ); document.write( "A line perpendicular to a vertical line is what we call a \"horizontal\" line, with $\"slope=0\"$ .
\n" ); document.write( "See both lines in the drawing below.
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The slope intercept form is $\"highlight%28y=0%2Ax%2B15%29\"$ or $\"highlight%28y=15%29\"$ .
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\n" ); document.write( "Pairs of perpendicular lines can present two different cases:
\n" ); document.write( "EITHER one line is vertical and the other is horizontal,
\n" ); document.write( "OR both lines have a slope and the product of the slopes is $\"%28-1%29\"$ , as for perpendicular lines with slopes $\"3\"$ and $\"%28-1%2F3%29\"$ , or perpendicular lines with slopes $\"%28-2%2F5%29\"$ and $\"5%2F2\"$ . \n" ); document.write( "

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